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Macedonian Veterinary Review


p-ISSN 1409-7621
e-ISSN 1857-7415

Co-publishing with:
De Gruyter

Abstract / References

Original Scientific Article
Published on: 15 October 2018

Pulsed-field gel electrophoresis used for typing of extended-spectrum-β-lactamases- producing Escherichia coli Isolated from infant ҆ s respiratory and digestive system
Gorica Popova1, Dean Jankuloski2, Benjamin Felix3, Katerina Boskovska4, Biljana Stojanovska - Dimzovska5, Velibor Tasic6, Katerina Blagoevska2
1Department of Clinical Microbiology, Institute for Respiratory Diseases in Children, Skopje, Republic of Macedonia
2Department of Molecular Microbiology, Faculty of Veterinary Medicine, Food Institute,University Ss Cyril and Methodius in Skopje
3French Agency for Food, Environmental and Occupational Health and Safety, Laboratory for Food Safety, Paris, France
4Pediatric Department, Institute for Respiratory Diseases in Children, Skopje, Republic of Macedonia
5Department of Microbiology, Faculty of Veterinary Medicine, Food Institute, University Ss Cyril and Methodius in Skopje
6Nephrology Department, University Children, s Hospital, Skopje, Republic of Macedonia


Escherichia coli infections are becoming increasingly difficult to treat because of emerging antimicrobial resistance, mostly to expanded-spectrum cephalosporins, due to the production of extended-spectrum β-lactamases (ESBLs).Despite extensive studies of ESBL- producing E.coli in adult patients, there is a lack of information about the epidemiology and spread of ESBL organisms in pediatric population. The aim of this study was to examine the gastrointestinal tract as an endogenous reservoir for the respiratory tract colonization with ESBL- E. coli in children, hospitalized because of the severity of the respiratory illness. The study group consists of 40 children with ESBL-producing E. coli strains isolated from the sputum and from the rectal samples. A control group of 15 E. coli isolated from rectal swabs of healthy children were included in the analysis. The comparison of the strains was done by using antimicrobial susceptibility patterns of the stains, and pulsed field gel electrophoresis was performed for molecular typing, using XbaI digestion. 90% of the compared pairs of strains in the study group were with identical antimicrobial susceptibility patterns and indistinguishable in 79.2% by the obtained PFGE – profiles.33.3% (5/15) of confirmed E. coli strains from the control group were found to be ESBL – producers. Resulting band profiles of all isolates demonstrated presence of 12 pulsotypes, with 100% similarity within the pulsotypes. Although, some isolates obtained from different patients were genetically indistinguishable, these strains were not hospital acquired, as none of the patients satisfied the criteria for hospital acquired pneumonia, and there was a lack of an obvious transmission chain. All ESBL –E. coli isolated from sputum in clinical cases were obtained from patients under the age of one. According to the resistance profile of the compared pairs and the PFGE comparison of all isolates, it can be concluded that the gastrointestinal tract is the main reservoir of ESBL-E. coli. Small age in infants is a risk factor for translocation of bacteria, enabling the colonization of the respiratory tract.
Key words: ESBL-producing Escherichia coli, resistance profile, GUT colonization, PFGE- typing

Mac Vet Rev 2018; 41 (2): 133-141
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Available Online First: 31 May 2018

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